To find the area of a shape, it depends on the shape itself, but the general concept is to calculate the amount of space inside a 2D figure. Here are the basic formulas for common shapes:

• Square or Rectangle: Multiply the length by the width (Area = length × width).
• Circle: Multiply pi (π, approximately 3.14159) by the radius squared (Area = πr²).
• Triangle: Multiply half of the base by the height (Area = ½ × base × height).
• Parallelogram: Multiply the base by the height (Area = base × height).
• Trapezoid: Multiply the average of the lengths of the two parallel sides by the height (Area = ½ × (a + b) × height).

Area is usually measured in square units, like square centimeters (cm²) or square meters (m²). The formula to use depends on the shape to be measured, often involving multiplying lengths of sides or radius and height in specific ways.

If more details about a specific shape or an example calculation are needed, that can be provided as well.